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By default Magneto only provide custom options without any description, if you want to customize with description then you must change in following files:
Step 1:-
In File
app\design\adminhtml\default\default\template\catalog\product\edit\option\type\select.phtml
Find the below code:
'<th class="type-sku"><?php echo Mage::helper('catalog')->__('SKU') ?></th>'+
Add these after just after
'<th class="type-description"><?php echo Mage::helper('catalog')->__('Description') ?></th>'+
Find the below code:
'<td><input type="text" class="input-text" name="product[options][{{id}}][values][{{select_id}}][sku]" value="{{sku}}"></td>'+
Add these after just after
'<td><input type="text" class="input-text" name="product[options][{{id}}][values][{{select_id}}][description]" value="{{description}}"></td>'+
Step 2:-
In File
app\code\core\Mage\Adminhtml\Block\Catalog\Product\Edit\Tab\Options\Option.php
Find the below code:
$value['sku'] = $this->htmlEscape($option->getSku());
Add these code just after
$value['description'] = $this->htmlEscape($option->getDescription());
Find the below code:
'sku' => $this->htmlEscape($_value->getSku()),
Add these code just after
'description' => $this->htmlEscape($_value->getDescription()),
Step 3:-
Add field in “catalog_product_option_type_value” table description.
Let me know if you have some query.

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